A mate down the road has a turbo off an STI he wanted me to fit to his MK1 WRX, along with some bigger injectors. Don't know anything about Scooby's I'm afraid, I'm just a wrench turner

I fitted the turbo and left the injectors until I find out exactly what they are, because he hasn't got a clue. Even sceptical about the turbo

But she flashed up fine and holds 1 bar of boost, but then stopped and left it until I can find out what's safe to run so he can make his way to a tuner and get it set up.

What boost should I set it at and what's the standard boost pressure supposed to be for this Jap crap?